Link previews are standard in most chat apps on iOS and Android. When a user sends a link through, it renders a short summary and a preview image in-line in the chat. The feature can leak IP addresses, expose links sent in end-to-end encrypted chats and has been caught unnecessarily downloading gigabytes of data quietly in the background Facebook Messenger, LINE, Slack, Twitter Direct Messages, Zoom and many others. In the case of Instagram and LinkedIn, it’s even possible to execute remote code on the companies servers through the feature.
Source: https://threatpost.com/linkedin-instagram-preview-link-rce-security/160600/